Cyril T. Brennan

Cyril T. Brennan, Aviation Attorney in Washington, District of Columbia

Over 17 years of legal practice · focused on Aviation, General, and Government

ShareholderatGreenberg Traurig Llp

Washington, DC

Practicing aviation in Washington since 2009.

17+
Years practicing
1
Bar admission

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Quick answer

Cyril T. Brennan is a shareholder based in Washington, DC. The practice focuses on Aviation, General, and Government. Cyril has over 17 years of legal experience. Currently practicing at Greenberg Traurig Llp.

Based in
Washington, DC
Experience
over 17 years
Known for
Aviation · General · Government
  • Handles Aviation, General, and Government matters from Washington, DC.
  • Over 17 years of practice as a licensed attorney.

About Cyril T. Brennan: Cyril T. Brennan is a shareholder based in Washington, DC. The practice focuses on Aviation, General, and Government. Cyril has over 17 years of legal experience. Currently practicing at Greenberg Traurig Llp.

Areas of practice

Legal matters Cyril takes on

Cyril concentrates on aviation, general, government, international, and securities. Each area below outlines the kind of case Cyril handles, typical outcomes to expect, and how the intake process starts.

Aviation cases in Washington, District of Columbia

Cyril takes aviation matters in Washington, District of Columbia. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Cyril agrees to represent you.

General cases in Washington, District of Columbia

Cyril takes general matters in Washington, District of Columbia. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Cyril agrees to represent you.

Government cases in Washington, District of Columbia

Cyril takes government matters in Washington, District of Columbia. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Cyril agrees to represent you.

International cases in Washington, District of Columbia

Cyril takes international matters in Washington, District of Columbia. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Cyril agrees to represent you.

Securities cases in Washington, District of Columbia

Cyril takes securities matters in Washington, District of Columbia. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Cyril agrees to represent you.

Biography

Meet Cyril T. Brennan — aviation lawyer in Washington

Cyril T. Brennan is a shareholder based in Washington, DC. The practice focuses on Aviation, General, and Government. Cyril has over 17 years of legal experience. Currently practicing at Greenberg Traurig Llp.

Cyril (Cy) Brennan focuses his practice on international trade and national security regulatory and compliance matters, with an emphasis on U.S. export controls, economic sanctions, and foreign direct investment matters. Cy provides clients experience across a broad array of U.S. international trade regulatory frameworks, including the International Traffic in Arms Regulations (ITAR), the Export Administration Regulations (EAR), the various U.S. sanctions programs administered by the Treasury Department’s Office of Foreign Assets Control (OFAC) and the Department of Commerce’s anti-boycott regulations. His clients include a wide of array of companies in the aerospace, defense, space and hi-tech sectors.

Cy also assists clients in complex matters involving the national security regulatory space. He focuses on representing clients before the Committee on Foreign Investment in the United States (CFIUS) in the context of mergers and acquisitions, as well as private equity, real estate, and venture capital investments. In this capacity he also advises on the National Industrial Security Program, including negotiating foreign ownership, control, or influence (FOCI) mitigation instruments with the Defense Counterintelligence and Security Agency (DCSA).

Prior to joining Greenberg Traurig, Cy served in the United States Senate in a foreign relations capacity, and later worked in-house at one of the world’s largest aerospace and defense companies.

Concentrations

•Export controls
•Economic sanctions
•Committee on Foreign Investment in the United States (CFIUS)
•Aerospace and Defense
•Space and Satellite regulatory matters
•Anticorruption compliance
•Foreign ownership, control or influence (FOCI)

Recognition & Leadership

Awards & Accolades

•Listed, Latin Lawyer, 'Latin Lawyer 250 - Practice Recognition: Anti-Corruption Investigations and Compliance,' 2020-2026
•Team Member, National Law Journal, “Washington, D.C. Litigation Department of the Year - White Collar Defense & Special Investigations,” 2022
•Team Member, 'Corporate & Finance - International Counsel in Latin America (Florida-Based),' Chambers Latin America Awards, 2017

Cyril's approach to aviation cases

Cyril (Cy) Brennan focuses his practice on international trade and national security regulatory and compliance matters, with an emphasis on U.S. export controls, economic sanctions, and foreign direct investment matters. Cy provides clients experience across a broad array of U.S. international trade regulatory frameworks, including the International Traffic in Arms Regulations (ITAR), the Export…

The kind of cases Cyril takes

Cyril reviews new inquiries case-by-case for aviation, general, and government matters in Washington and the surrounding District of Columbia area.

Credentials

Education, bar admissions, and languages

  • Northwestern University School of Law J.D. Member Northwestern University School of Law J.D. Youth and Women Immigration Law Clinic Northwestern University School of Law J.D. 2008 Senior Edit

  • University of Seville, Spain

    Semester Abroad · 2002

Jurisdictions

Cyril's state bar admissions

  • District of Columbia

    2009 · ACTIVE

Cyril studied at — in Northwestern University School of Law J.D. Member Northwestern University School of Law J.D. Youth and Women Immigration Law Clinic Northwestern University School of Law J.D. 2008 Senior Edit and Semester Abroad in University of Seville, Spain.

Law school and academic background

Cyril completed — in Northwestern University School of Law J.D. Member Northwestern University School of Law J.D. Youth and Women Immigration Law Clinic Northwestern University School of Law J.D. 2008 Senior Edit and Semester Abroad in University of Seville, Spain. Formal legal training is one signal of substantive knowledge — the day-to-day practice Cyril runs in District of Columbia is where that training gets applied to real client questions.

Affiliations

Cyril's professional memberships and bar associations

  • Professional & Community Involvement •Elected Member, International Institute of Space Law, 2024 •Member, American Bar Association •Steering Committee, Aerospace & Defense Industries Committee, Section of International Law and Practice

    2014-2015 · membership

Locations

Cyril T. Brennan's office in Washington

Cyril's primary office is at 2101 L Street, N.W., Suite 1000, Washington, DC, 20037. In-person meetings are by appointment; a phone intake usually comes first.

Main office

Greenberg Traurig Llp

2101 L Street, N.W., Suite 1000

Washington, DC 20037

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Client feedback

Client reviews of Cyril T. Brennan

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Hiring guide

How to hire Cyril T. Brennan — what to expect in your first consultation

Working with a new aviation attorney should feel structured. Here's how the first two conversations with Cyril usually go, from the moment you request a consult to the day representation begins.

Consultation formats and pricing

Cyril charges for the initial consult. That fee is credited toward representation if you retain Cyril's office.

What to bring to your first meeting

Bring any documents you already have — police reports, medical records, filed pleadings, correspondence from an insurer, a copy of the contract at issue. If you're not sure, err on the side of bringing everything; Cyril will tell you what matters and what doesn't.

Questions to ask a aviation attorney in Washington, District of Columbia

A short list to run through before you commit: How many aviation matters have you handled in the last year? What's your fee structure? Who else in the office will work on this? What's your realistic estimate of timeline and range of outcomes? How do I reach you between meetings?

Fees & payment

Fees, payment methods, and consultation options for Cyril

Cyril discusses fees during intake so the arrangement fits the matter. Contingency, hourly, and flat-fee options are all common in aviation practice — ask which fits.

Hourly rates, contingency fees, and flat-fee options

Every aviation matter is priced differently. Simple document review might be a flat fee. Injury litigation is often contingency. Complex commercial disputes usually run hourly with a retainer. Cyril confirms the model in the engagement letter before any work starts.

Payment methods and payment plans

Cyril's office accepts standard payment methods. Ask about payment plans if the retainer is a stretch — many aviation practices work with clients on structured schedules.

Frequently asked

Frequently asked questions about Cyril T. Brennan

  • How much does it cost to hire Cyril for a aviation case?

    Cost depends on the type of matter, the fee model (contingency, flat, hourly), and how contested the case becomes. Cyril walks through the likely range during the consult so there are no surprises.

  • Does Cyril offer a free consultation?

    Cyril charges for the initial consult; that fee is credited toward representation if you retain Cyril's office. Some aviation attorneys offer free consults — check Cyril's current terms during booking.

  • How long do aviation cases in District of Columbia typically take?

    Simple aviation matters can wrap in a few weeks; disputed cases can run 6–18 months from intake to resolution, longer if the matter goes to trial. Cyril gives a realistic estimate for your facts at the consult — vague answers here are a red flag.

  • Can Cyril take my case if I'm outside Washington?

    Cyril is licensed in District of Columbia. Matters governed by District of Columbia law are the natural fit. Out-of-state matters are handled case-by-case, sometimes with local co-counsel. Ask during intake — Cyril will tell you if the case is a fit or refer you to someone closer to your court.

  • What should I bring to my first meeting with Cyril?

    Bring every document that touches the dispute: contracts, correspondence, police or medical reports, filed pleadings, invoices, photographs, insurance letters. Also bring a written timeline of what happened, in your own words. Cyril will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.

  • Is Cyril accepting new aviation clients right now?

    Cyril's intake status shifts week to week. Submit the form; the office will confirm availability or refer the matter out.

Areas served

Aviation attorneys serving Washington and Belize City in District of Columbia

Cyril handles aviation matters throughout District of Columbia. Each city below is a direct link into the search page for verified aviation attorneys in that community.